Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Service Gauge Port Valves
The high-pressure service gauge port valve is located on the condenser-to-evaporator line.
The low-pressure service gauge port valve is located on the TXV manifold and tube assembly.
| Item | Part Number | Description |
|---|---|---|
| 1 | 19D702 | Low-pressure service gauge port valve cap |
| 2 | - | Low-pressure service gauge port valve |
| 3 | 19D701 | Low-pressure Schrader-type valve |
| 4 | 19D701 | High-pressure Schrader-type valve |
| 5 | - | High-pressure service gauge port valve |
| 6 | 19D702 | High-pressure service gauge port valve cap |
The fitting is an integral part of the refrigeration line or component.
- Special couplings are required for both the high-side and low-side service gauge ports.
- A very small amount of leakage will always be detectable around the Schrader-type valve with the service gauge port valve cap removed, and is considered normal. A new Schrader-type valve core can be installed if the seal leaks excessively.
- The service gauge port valve caps are used as primary seals in the refrigerant system to prevent leakage through the Schrader-type valves from reaching the atmosphere. Always install and tighten the A/C service gauge port valve caps to the correct torque after they are removed.
NO RELATED
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.